接前一篇文章《Linux内核中ideapad-laptop.c文件全解析1》，地址为：

Linux内核中ideapad-laptop.c文件全解析1_蓝天居士的博客-CSDN博客

上一回讲到了ideapad_acpi_driver。本文对于其成员进行详细解析。再列一下其源码：

static const struct acpi_device_id ideapad_device_ids[] = {{"VPC2004", 0},{"", 0},
};
MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);static struct platform_driver ideapad_acpi_driver = {.probe = ideapad_acpi_add,.remove = ideapad_acpi_remove,.driver = {.name   = "ideapad_acpi",.pm     = &ideapad_pm,.acpi_match_table = ACPI_PTR(ideapad_device_ids),},
};module_platform_driver(ideapad_acpi_driver);

ideapad_device_ids数组也可以说是表的定义和初始化就在上边，它是用来匹配平台驱动和平台设备的。

probe探测函数对应的ideapad_acpi_add函数在同文件（drivers/platform/x86/ideapad-laptop.c）中实现，源码如下：

static int ideapad_acpi_add(struct platform_device *pdev)
{struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);struct ideapad_private *priv;acpi_status status;unsigned long cfg;int err, i;if (!adev || eval_int(adev->handle, "_CFG", &cfg))return -ENODEV;priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);if (!priv)return -ENOMEM;dev_set_drvdata(&pdev->dev, priv);priv->cfg = cfg;priv->adev = adev;priv->platform_device = pdev;ideapad_check_features(priv);err = ideapad_sysfs_init(priv);if (err)return err;ideapad_debugfs_init(priv);err = ideapad_input_init(priv);if (err)goto input_failed;err = ideapad_kbd_bl_init(priv);if (err) {if (err != -ENODEV)dev_warn(&pdev->dev, "Could not set up keyboard backlight LED: %d\n", err);elsedev_info(&pdev->dev, "Keyboard backlight control not available\n");}/** On some models without a hw-switch (the yoga 2 13 at least)* VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.*/if (!priv->features.hw_rfkill_switch)write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);/* The same for Touchpad */if (!priv->features.touchpad_ctrl_via_ec)write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, 1);for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))ideapad_register_rfkill(priv, i);ideapad_sync_rfk_state(priv);ideapad_sync_touchpad_state(priv);err = ideapad_dytc_profile_init(priv);if (err) {if (err != -ENODEV)dev_warn(&pdev->dev, "Could not set up DYTC interface: %d\n", err);elsedev_info(&pdev->dev, "DYTC interface is not available\n");}if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {err = ideapad_backlight_init(priv);if (err && err != -ENODEV)goto backlight_failed;}status = acpi_install_notify_handler(adev->handle,ACPI_DEVICE_NOTIFY,ideapad_acpi_notify, priv);if (ACPI_FAILURE(status)) {err = -EIO;goto notification_failed;}#if IS_ENABLED(CONFIG_ACPI_WMI)for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) {status = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i],ideapad_wmi_notify, priv);if (ACPI_SUCCESS(status)) {priv->fnesc_guid = ideapad_wmi_fnesc_events[i];break;}}if (ACPI_FAILURE(status) && status != AE_NOT_EXIST) {err = -EIO;goto notification_failed_wmi;}
#endifreturn 0;#if IS_ENABLED(CONFIG_ACPI_WMI)
notification_failed_wmi:acpi_remove_notify_handler(priv->adev->handle,ACPI_DEVICE_NOTIFY,ideapad_acpi_notify);
#endifnotification_failed:ideapad_backlight_exit(priv);backlight_failed:ideapad_dytc_profile_exit(priv);for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)ideapad_unregister_rfkill(priv, i);ideapad_kbd_bl_exit(priv);ideapad_input_exit(priv);input_failed:ideapad_debugfs_exit(priv);ideapad_sysfs_exit(priv);return err;
}

remove移除函数对应的ideapad_acpi_remove函数也在同文件（drivers/platform/x86/ideapad-laptop.c）中实现，源码如下：

static int ideapad_acpi_remove(struct platform_device *pdev)
{struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);int i;#if IS_ENABLED(CONFIG_ACPI_WMI)if (priv->fnesc_guid)wmi_remove_notify_handler(priv->fnesc_guid);
#endifacpi_remove_notify_handler(priv->adev->handle,ACPI_DEVICE_NOTIFY,ideapad_acpi_notify);ideapad_backlight_exit(priv);ideapad_dytc_profile_exit(priv);for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)ideapad_unregister_rfkill(priv, i);ideapad_kbd_bl_exit(priv);ideapad_input_exit(priv);ideapad_debugfs_exit(priv);ideapad_sysfs_exit(priv);return 0;
}

实际上通过ideapad_acpi_remove函数更容易看出ideapad_acpi_add函数完成的工作，包括了：

• sysfs初始化：ideapad_sysfs_init
• debugfs初始化：ideapad_debugfs_init
• 输入初始化：idea_input_init_init
• 键盘（按键）背光初始化：ideapad_kbd_bl_init
• 配置初始化：idea_dytc_profile_init
• 背光初始化：ideapad_backlight_init
• acpi通知处理：acpi_install_notify_handler
• wmi通知处理：wmi_install_notify_handler
• ……

欲知各个函数的具体实现细节，且听下回分解。